String getGaScript(String id) => '''
<script async src="https://www.googletagmanager.com/gtag/js?id=$id"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag() {
    dataLayer.push(arguments);
  }
  gtag("js", new Date());
  gtag("config", "$id");
</script>
''';
